Improved sled-brake



S. A; MITCHELL.

Sled Brake.

No. 88,797. A Patented April 13, 1869.

N. PETERS. Pholo-Lflhognphor. Walhi nnnnn C.

a tluitd s. A. MITCHELL, or ALSTEAD CENTRE; NEW HAMPSHIRE;

' Letters Patent No. 88,797, dated .April 13, 1869.

mnovnb BLED-BRAKE.

The Schedule referred to in these Letters Patent and making part of the same.

' exact description thereof, reference being had to the accompanying drawings and letters of reference marked thereon, making a part of this specification.

The nature of my invention consists in furnishing a sled or sleigh with a self-adjusting brake, that will increase and decrease in power'with the pressure of the load upon the different grades.

To enable others to make and use my invention, I will proceed to describe its construction and operation.

I construct my sleds or sleighs in a common form, and apply thereto my invention, as shown in the accompanying drawings.

Figure 1 is an angular sectional view of my'invention.

Figure 2 is the same view, with slide E thrown forward.

Figure 3 is a detached angular view of the slide E, with the stops H and bar F attached, also showing the eye-bolt 4. 7

Description.

A and B, respectively, represent sleds or sleighs.

G represents bunks.

D represents reaches.

E represents slide.

F represents bar attached to the under side of the slide E, and passing under the guides H and raves M.

H represents the guides to slide E, secured to the beams of sled A, and retains the slide E in position.

I represents levers, or dogs, attached to sled A by pivot L.

I represents rods, or links, pivoted to the levers I and bar F, thereby connecting them.

J represents king-bolt.

K represents stops, attached to slide E, to prevent its sliding too far.

L represents pivots to levers I.

M represents raves to sled A.

N represents catch to hold the sled A forward when it is necessary to back the sleds. v

2 and 3, dilferent points to hinge the levers I, to in,- crease or decrease their power to the amount required.

Operation. When the various parts are properly adjusted, a forward pressure of the load moves-the slide E forward upon the sled A, thereby acting through the bar I! and v connecting-links I, upon thelevers I, with a downward pressure, the levers I being pivoted at their forward end to the sled A; therefore the rear end is depressed in contact with the road, and the forward pressure of the load is converted into a'friction of the levers I upon the road, increasing and decreasing in thesame ratio with the pressure of the load upon the different grades or inclines. Therefore the device becomes self-adj usting, increasing and decreasing in' power to suit the different inclinations of the road.

A backward pressure of the team increases the friction. A forward draught moves the sled A forward in its relations to the slide E, thereby raising the lovers I, and removing the friction of the brake. 'Of course the device acts equally well when sled A is used as a bob, or logging sled, with the rear end of the load dragging upon the road.

The object of my invention is to produce a self-adjusting sled or sleigh-brake, that will increase and decrease in power of its own accord, upon the difl'erent inclines or grades of road.

I do not claim theuse of the lever I, broadly.

What I claim as my invention, and desire to secure by Letters Patent, is-

In combination with the slide E and guides H, the bar F, link I, and pivoted lever I, when applied to a sled substantially as shown and herein described.

S. A. MITCHELL.

Witnesses:

E. J. CARPENTER, M. E. CARPENTER. 

